When Mendel crossed a strain of tall pea plants with a strain of short pea plants, he observed that all of the plants in the F1 generation were tall. This suggests that

When Mendel crossed a strain of tall pea plants with a strain of short pea plants, he observed that all of the plants in the F1 generation were tall. This suggests that 



a. the tall trait was controlled by a dominant factor
b. the short trait was controlled by a dominant factor
c. both traits were controlled by a recessive factor
d. allowing plants to cross-pollinate for one generation




Answer: A


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